Hair straightener



FIG. 1 is a perspective view of a new, original and ornamental design for a hair straightener;

FIG. 2 is a right side elevation view of FIG. 1 ;

FIG. 3 is a left side elevation view of FIG. 1 ;

FIG. 4 is a front elevation view of FIG. 1 ;

FIG. 5 is a rear elevation view of FIG. 1 ;

FIG. 6 is a top plan view of FIG. 1 ; and,

FIG. 7 is a bottom plan view of FIG. 1 .

In the drawings, the evenly-spaced broken lines illustrate portions of the hair straightener that form no part of the claimed design. The dash-dot broken lines illustrate a boundary to the claim and form no part thereof. 

CLAIM The ornamental design for a hair straightener, as shown and described. 